Remove some BUI boilerplate (#28399)

* Remove some BUI boilerplate

- The disposals overrides got removed due to the helper method handling it.
- Replace window creation with CreateWindow helper.
- Fixed some stinky code which would cause exceptions.

* More

* moar

* weh

* done

* More BUIs

* More updates

* weh

* moar

* look who it is

* weh

* merge

* weh

* fixes

Content.Client/Salvage/UI/SalvageExpeditionConsoleBoundUserInterface.cs

@@ -30,17 +30,9 @@ public sealed class SalvageExpeditionConsoleBoundUserInterface : BoundUserInterf
     protected override void Open()
     {
         base.Open();
-        _window = new OfferingWindow();
+        _window = this.CreateWindow<OfferingWindow>();
         _window.Title = Loc.GetString("salvage-expedition-window-title");
-        _window.OnClose += Close;
-        _window?.OpenCenteredLeft();
-    }
-
-    protected override void Dispose(bool disposing)
-    {
-        base.Dispose(disposing);
-        _window?.Dispose();
-        _window = null;
+        _window.OpenCenteredLeft();
     }
 
     protected override void UpdateState(BoundUserInterfaceState state)